如何在上传时裁剪图像？ [英] How to crop an image while uploading?

问题描述

我正在做一个社交网络项目，我可以选择添加/编辑照片。当用户点击按钮时，图像将被上传到数据库并且它将被更新...是否可以裁剪图像在它保存到数据库之前。

I am doing an social networking project ,where i have an option to add/edit photos ,When user clicks the button the image will be uploaded to the database and it will be updated...is it possible to crop the image before it is saved to the database.

推荐答案

只需调用此函数..与param源，目标和大小你想要的： ）

simply call this function ..with param source ,destination and size what u want :)

function cropImage($source,$dest,$whsize) {

                $size = getimagesize($source);
                $w = $size[0];
                $h = $size[1];
                $xratio=$w/$whsize;
                $yratio=$h/$whsize;

                if($xratio > $yratio)$multiplier=$xratio;
                else $multiplier=$yratio;

                $nw=$w/$multiplier;
                $nh=$h/$multiplier;
                switch($size[2]) {
                    case '1':
                    $simg = imagecreatefromgif($source);
                    break;
                    case '2':
                    $simg = imagecreatefromjpeg($source);
                    break;
                    case '3':
                    $simg = imagecreatefrompng($source);
                    break;
                }

                $dimg = imagecreatetruecolor($nw, $nh);

                $wm = $w/$nw;
                $hm = $h/$nh;

                $h_height = $nh/2;
                $w_height = $nw/2;

                if($w> $h) {

                    $adjusted_width = $w / $hm;
                    $half_width = $adjusted_width / 2;
                    $int_width = $half_width - $w_height;

                    imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);

                } elseif(($w <$h) || ($w == $h)) {

                    $adjusted_height = $h / $wm;
                    $half_height = $adjusted_height / 2;
                    $int_height = $half_height - $h_height;

                    imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);

                } else {
                    imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
                }
             $dest=$dest.'jpeg';
                imagejpeg($dimg,$dest,100);
        }       

这篇关于如何在上传时裁剪图像？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！